EFFECT OF SOWING TIME AND SPACING ON GROWTH, YIELD AND YIELD CONTRIBUTING CHARACTERS OF MUNGBEAN MUTANTS IN THREE LOCATIONS OF BANGLADESH
Field experiments were conducted with mungbean mutants to evaluate their yield performance as affected by time of sowing and spacing. The mutant lines were MBM-656-51-2 and MBM-427-87-3, and the check varieties were BARI Mung8 and Binamung-8. Total four experiments were conducted of which two experiments were executed at Bangladesh Institute of Nuclear Agriculture (BINA) substations, Barishal and Ishurdi during 2018 and other two experiments at BINA substations, Ishurdi and Magura during 2019. Four different sowing times were Jan. 15, Feb. 1, Feb. 15, and Mar. 1 during 2018 and Feb. 15, Feb. 28, Mar. 15 and Mar. 30 during 2019. Three levels of row spacing were 20 cm, 25 cm and 30 cm. During 2018, the interaction effect of sowing time, variety and row spacing showed that Binamung-8 produced the maximum seed yield (1157 kg ha-1) at 20 cm row spacing when the sowing date was Feb 15; followed by MBM-656-51-2 with the same sowing date and spacing. The advanced mutant line MBM-656-51-2 required the least average crop duration of 72 days) and BARI Mung8 required the maximum average duration of 79 days) during 2018; which required 75 days and 78 days during 2019, respectively. During 2019, the interaction effect of sowing date, variety and row spacing showed that MBM-656-51-2 produced the maximum seed yield (843.3 kg ha-1) followed by BARI Mung-8 (828.6 kg ha-1) at 25 cm row spacing when the sowing time was Feb 18. Overall results suggest that to ensure satisfactory yield of mungbean, Feb. 15 to Feb. 28 sowing at 20-25 cm row spacing is needed for all the studied locations.
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